CBSE ADDA

X Class 10 NCERT Activity Explanation Class 10 Metals and Non Metals Activity 3.1 Page No. 37 Take samples of iron, copper, aluminium and magnesium. Note the appearance of each sample. They have a shining surface. Clean the surface of each sample by rubbing them with sand paper and note their appearance again. They become more shiny. => Freshly cut Metal have shiny surface Activity 3.2 Page No. 37 Take small pieces of iron, copper, aluminium, and magnesium. Try to cut these metals with a sharp knife and note your observations. They are very hard to cut. Hold a piece of sodium metal with a pair of tongs and try to cut it with a knife. Sodium can be cut easily with knife. Hence K and Na are soft metal cut with knife Activity 3.3 Page No. 38 Take pieces of iron, zinc, lead and copper try to strike it four or five times with a hammer. These metals are beaten into thin sheet on hammering. This property of metal is called malleability and metals are called malleable. Activity 3.4 Page

NCERT Activity Chapter 02 Acid Bases and Salt Class 10 Chemistry Activity 2.1 Indicator Acid Base Red litmus No Change Blue Blue Litmus Red No change Phenolphthalein Colourless Pink Methyl Orange Pink   Yellow Indictors are substance which change colour in acidic or basic media. Activity 2.2 There are some substances whose odour changes in in acidic or basic media. These are called olfactory indicators. Like onion vanilla, onion and clove. These changes smell in basic solution. Activity 2.3 Take about 5 mL of dilute sulphuric acid in a test tube and add few pieces of zinc granules to it. => You will observe bubbles of hydrogen gas on the surface of zinc granules. Zn + H2SO4 --> ZnSO4 + H2 => Pass the Hydrogen gas through the soap solution. Bubbles formed in the soap solution as Hydrogen gas it does not get dissolved in it

X NCERT ACTIVITIES Class 10 Chemical Reactions and Equations Activity 1.1 (Experiment): Activity 1.1 Clean a magnesium ribbon by rubbing it with sandpaper to remove layer of carbonate and oxide. Burn it using a spirit lamp you get white ash of  MgO.            Mg (s) + O 2 (g)      à MgO(s) => Magnesium ribbon burn with dazzling light and white powder of MgO is formed which is basic in nature It is an example of combination reaction in which single compound break into two or more substance. Activity 1.2 (Experiment): Take lead nitrate solution in a test tube. Add potassium iodide solution to this. => Yellow precipitate PbI 2 is formed. Substance Insoluble in water is called precipitate. Pb(NO 3 ) 2   (aq)     +      2KI    à PbI 2 (s) ( ¯ )    +  2 KNO 3   (aq) This is an example of precipitation reaction . This is an example of Double decomposition reaction in which there is exchange of radicals. Activity 1:3 (Experiment): Take a few zinc granules

Biology Class 10 Chapter Life Process class 10   Like and subscribe channel  Watch Video Life process Part 01  Life process Part 02  Life process Part 03  Life process Part 04  Life process Part 05  Life process Part 06  Life process Part 07  Life process Part 08  Life process Part 09  Life process Part 10 

CBSE TEST PAPER-01  SCIENCE & TECHNOLOGY  (Class-10) Chapter 6 : Life Process 1 . What are the raw materials for photosynthesis? (1 mark) Answer: The raw materials and other necessary items required for photosynthesis are Sunlight, Water, CO 2 and Chlorophyll. 2. What is the role of bile juice in digestion? (1 mark) Answer: Bile is alkaline in nature and it is temporarily stored in gallbladder  and helps in digestion of fats,   it also helps in absorption fats. 3. Write the equation for respiration? (1 mark) Answer: C 6 H 12 O 6   --- > C 3 H4O 3   ----->   6CO2 +  6H2O +  38ATP 4. Name three types of blood vessels used in the transport of blood. (1 mark) Answer: Arteries, vein and capillaries Note: There are three major types of blood vessels: the arteries, which carry the blood away from the heart; the capillaries, which enable the actual exchange of water and chemicals between the blood and the tissues; and the veins, which carry blood from the